Calculate an average by using this formula: sum of elements / number of elements. Find the sum of the elements by adding up the values of all the numbers in the set. Find the number of elements by counting how many different values are in the set.
Continue ReadingAdd up the values of each number in the set to find the sum. If the set of data is 21, 22, 24 and 26, then the sum is 93, because 21 + 22 + 24 + 26 = 93.
Count the number of values in the set. If the set of data is 21, 22, 24 and 26, then the number of elements in the set is four, because there are four different values in the set.
Find the average by using this formula: sum of elements / number of elements. If the set of data is 21, 22, 24 and 26, the average is 93 / 4. Divide the sum of elements by the number of elements in the set to simplify the average. If the sum of elements / number of elements is 93 / 4, then the average is 23.25.